First get a water bottle and cut the bottom off of it. Rubber band a piece of cloth over the top of it like this,
Then you need some bubble mix you can use some store bought stuff or just put some dish soap in a bowl and add some water to make it last longer. Either way you should pour it into a bowl for easy dipping.
Then just dip the cloth into the bubble mix and blow to get super long snake bubbles.
Make sure you don't breath through your mouth or you will get a mouthful of bubbles.
These are a lot of fun you can have contests to see who blows the longest bubbles or just try to pop them all.